Apparatus for preparing members for assembly



June 24, 1930. l M L STRAWN 1,768,270

APPARATUS FOR PREPARIING MEMBERS FOR ASSEBLY Filed April 13, 1927 Patented .Furie 24, 1930 UE'E'EO @FICE MARION LLEWLLYN STRAWN, OF LA GRANGE, TLLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK APPARATUS FOR PREPARING MEMBERS FOR ASSEMBLY Application iled April 13,

This invention relates to apparatus for preparing members for assembly, and more particularly to apparatus for preparing a part of a telephone calling device for assembly.

This invention is particularly applicable in preparing for assemblage an inside bearing boss of a governor cup of a telephone calling device ofthe type disclosed in U. S. Patent No. 1,161,854, issued to O. F. Forsberg, hlovember 30, 1915, but it should be understood that it is capable of other applications. Upon the boss one end of a governor shaft is journaled, the opposite end thereof being journaled in a bridge piece secured to a case member in vthe final assemblage of the device, thrust washers being provided on the shaft between the boss and the bridge piece at either end of the shaft. Heretofore, due to slight manufacturing variations in the dimensions of the particular parts to be assembled and to provide proper clearances between the rotatable and stationary parts, it has been the practice in some instances to selectively assemble with the parts washers of the thickness requisite to provide 'for a. predetermined overall dimension which will fill the space between the opposed flat surfaces of the bearing boss of the individual. cup and associated bridge piece.

The objects of this invention are to provide an improved apparatus for accurately preparing parts for assemblage in an efficient and economical manner.

In accordance with the general features of this invention, as embodied in one form thereof, an apparatus is provided, which includes means for revolvably supporting a part to be machined in cooperative relation with a cutting tool, which is stationary during the machining operation, the effectiveness of the tool, or the amount of material displaced by the tool on the revolving part being controlled by the overall dimensions of the partially assembled parts to be finally assembled with the first mentioned part, which partially assembled parts are used as a gauge to longitudinally position the cutting edge of the tool with respect to the sur- 1927.` Serial 110.183,42.

face to be machined. Means are provided for holding the preliminarily assembled parts in cooperating relation with the tool during the machining operation and also for laterally moving the revolving part past the cutting edge of the stationary tool to perform the machining operation.

Other objects and advantages of this invention will more fully appear from the following detailed description taken in connection with the accompanying drawings which illustrate one embodiment of an apparatus for preparing parts for assemblage, in whichl Fig. 1 is a side view of an apparatus designed for preparing a part of a telephone calling device for assemblage;

Fig. 2 is an enlarged, fragmentary, vertical section thereof, and

Fig. Bis a fragmentary end view of Fig. 2 looking toward the left.

Referring now to the drawings in detail wherein like reference numerals indicate similar parts, an upright standard or frame 10 suitably secured to the upper surface of a bench 11 or other supporting means is provided with a head 12. Reciprocably mounted in a bore 13 formed longitudinally in the head 12 is a plunger 14, which is retained from rotation therein by a vspline 17. Free to rotate upon an annular shouldered portion 18 extending from the left end of the head 12 is an eccentric sleeve 19 provided with a flange 20at its right end. To the peripheralsurface of the flange 2O is fixed a handle21 whereby the eccentric may be rotated upon the portion 18 of the head 12 as will be referred to hereinafter. Rotatably mounted upon the eccentric sleeve 19 is a wheel 24, a reduced annular portiony25 at the right end thereof being engaged by a driving beltv26V which in the operation of the apparatus may be driven from any suitable source of` power A(not shown). A further l reduced annular portion 27 of the wheel 24 at the left end thereof is provided with a flat machined end face 28, the diameter of the annular portion being such that the inside diameter of a circular flange of a case member for a telephone calling device 81 may pressed clamping Vjaws 33 for engaging and retaining the case member 31 in operative position upon the wheel, handles 34 being provided for openino the jaws when mounting or removing the case member.

Eccentrically secured to the case member 31 upon its outer flat face is a circular governor cup 35 axiallyprovided with an apertured bearing boss38 Von its inside flat surface which in the opera-tim@ Ofthe'lppamtus to be presently described is machined by a cutting edge or point 39 of a stationary tool 40 fixed to the left end of the plunger 14. The right end of the bore 13 of the head `12 is of greater diameter th-an the plunger 14 mounted therein and surrounding the plunger 14 witnin .the space thus forme-d is aV compression spring 42, opposite ends theyre-v of engaging a shoulder 44 formed in VtheY head 12 along the bore 13and an annular flange formed onv the plunger 14, the flange 45 being 4slidably mounted in the enlarged portion of the base 13. The spring 42, it will be apparent, tends normally to .move the plunger 14 toward the right along the bore 13 and is limited in this niolvement by a stop plate 46 fixed to the head 12 at the end of the bore, the flange 45 of thc plunger engaging the stop.

VThe right end of the head 12 is provided with a comparatively large recess 47 which, as clearly shown in Fig. 3 is .eccentrically disposed with respect to the axis of the bore 13 and plunger 14. Within theV recess v47 and integral with the surrounding wall and disposed directly below and centered with `the plunger 14 is a cradle 43 Comprising similar vertically inclined surfaces so ranged that upon entering a governor semblage 49, forming a part of the telephone calling device of the type hereinbefore mentioned within the recess, the peripheral surface thereof :will engage the inclined surfaces, in which position the axis `of a shaft 52 of the governor and the axis of the plunger 14 is a depression 53 adapted to in the projecting right end face of the r"plunger 14 is a depression 43 adapted to receive a reduced left end .54 of the Governor lI Y shaft 52. When mounting the governor assemblage 49 Vupon the cradle 48 a thrust washerv 55 is positioned upon either end of the shaft 52, the right end thereof also having a reduced end 56 which will be referred to presently again. 7^After positioning the governor assemblage 49 upon the cradle 48 it is moved longitudinally thereon .to insert the reduced end 54 of the shaft 52Within the depression 53 of the plunger 14. Y

Botatably mounted in a pair of spaced lugs 57 formed upon the right end of the frame 10 below the outer wall of .therecess 47 of the head 12 is a shaft 59. Fixed to 'the shaft 59 between the inner facesY of the lugs 57 is a lever 60 having a pair of upwardly and outwardly extending arms 61 (Fig. 3) each arranged to engage an outer vsurface of a foot 62 formed `at either .end of a bridge piece 63 also forming a part of the telephone calling device hereinbefore referred to, the opposite inner surfaces of the feet 62 resting against a machined end face v.6 4 of the head 12 at di-ametrically opposite .sides of the peripheral wall of ythe eccentrically disposed recess 47. A compression spring 66, opposite ends of which are .entered in pockets formed in the standard 10 and the lever tend Vto normally rotate .the lever in a counter-clockwise .direction (Fig. 2) to clamp the bridge piece 63 against the end face of the head. 'In positioning the bridge piece 63 as just .described'an aperture provided therein, upon which the reduced end 5.6 ofthe shaft 52 is journaled in the final assemblage .ofthe telephone calling device, is alined with @the end 5.6 yof the shaft which is entered therein. lt is tobe under stood that the tension of the spring 66 acting upon the lever 60 is sullicient to .overcome the force of the spring 42 tending to nieve the plunger 14 to the right. Upon the left end of the shaft 59 3) is a handle 67 for operating the lever 60 when mounting or removing the bridge piece 63 from the reduced end 56 o f the governor shaft 52 anc the machined vend face of the head 12v.

ln the final assemblage of the telephone calling' device as clearly shown in the aflora mentioned patent, the inner surfacesV .of the feet 62 of the bridge piece 63, shown ing the machined end ,face or the he d a, are engaged with and secured to ,tbe inner flat surfaceof the case member 31, vshown clampedvagainst the aat machined end face 26 of the wheel `24, the governor assemblage being rotatably mounted between the boss 38 `of the case member 31 andthe rbridge piece 63. lt will be apparent from the foregoing description uponrnounting the governor assemblage 49 between right end of the plunger14 and the inside sur-V faces of the arms 61 of the lever 6.0 as just described, that the plunger 14 will be moved against the action ofthe spring 42 along thebore 13 and .cause the cutter 40 to exten-d into the 'governor housing 35, from the inside fiat surface of the case member A31,121

llO

distance which will be equal to the overall length of the particular parts comprising the governor assemblage. After tl governor assemblage 49 and bridge piece G3 have been clamped upon the head 12 and thereby correctly positioning the cutter 40, the latter is prevented from moving toward the right due to any end thrust thereon during the cutting operation, to be presently described, by a shoe 68 mounted in an aperture G9 formed in the head l2. The shoe 68 is clamped against the peripheral surface of the plunger 14 by a handled pin 70 threaded into the upper end of the aperture 69. The

vpitch of the thread on the pin 7() and the wall or" the aperture 69 is such that a quarter revolution of the handle provided on the pin one way or the other is sufficient to clamp the shoe 68 or release it, respectively.

Vith the case member 81 and the governor assemblage 49 and bridge piece 63 clamped upon the wheel 24 and head 12, respectively, and the cutter clamped in its predetermined position, as just described, the operation of preparing the bearing boss 38 of the case member by machining it for the final assemblage oi the calling device is as fol lows: The wheel 24 is caused to rotate at a comparatively high rate of speed through the driving belt 26 which is connected to source of power (not shown) and simultaneously with the rotation of the Wheel the handle 21 is moved in a. counter-clockwise direction (Fig. 3) through an angle ot 90". Thus the rotating boss 38 is laterally swung along a curved path and into engagement with the stationary cutting edge 89 of thel cutter 40, thereby resulting in the inner fiat face being turned down, suiiicient metal being removed to permit the governor assemblage and the bridge piece to be mounted upon the case member with a preeetermined accuracy in the nal asemblage of theV calling device. As previously described the lateral movement of the boss 38 during its rotation is accomplished through the mounting of the belt driven wheel 24 upon the eccentric sleeve 19. The cutter 40 is adjustably mounted upon the plunger 14 as shown, so that it may be adjusted thereon ai'ter sharpening upon wearing down at its cutting edge, whereby the overall length of the plunger and cutter will remain constant for a particular set up of parts to be prepa-red for assemblage.

By means of this invention wherein the bearing boss 38 is prepared to accurately accommodate the particular governor assemblage to be associated therewith it is not.

necessary to maintain the dimensions of the parts composing the governor within extremely close limits nor to so select the parts as to produce a governor having closely limited overall dimensions. Although this invention has herein been described in connection with a telephone calling device,

it will be understood that the invention is jacent a working portion of the workingV means', means for holding another member forming a part of the assemblage in operative relation with another portion of the working means to control the effectiveness of the working means, and means for causing a relative movement between the first memier and the working means to prepare the first-mentioned member for a predetermined assembled relation with the latter member.

2. In apparatus for preparing a member for assemblage with another member, a longitudinally movable tool, means for guiding the tool, means 'for normally urging the tool to a nonoperative position, means eccentrically mounted for supporting a member in position to be worked on adjacent the tool, means for maintaining another member to be assembled with the first member in engagement with the tool to displace the tool an amount determined by an overall dimension or' the latter member, and means for causing a relative movement between the rst member and the tool to prepare the first-mentioned member for a predetermined assembled relation with the latter member. ln apparatus for preparing a member for assemblage with another member, a longitudinally movable tool, means for guiding the tool, means normally urging the tool to a non-operative position, an element eccentrically and rotatably mounted upon he tool guiding means for supporting a member in position to be worked on adjacent the tool, means Jfor maintaining another member to be assembled with the first member in operative relation with the tool to displace the tool an amount determined by an overall dimension of the latter member, and means for simultaneously rotating and moving the element upon its eccentric mounting to cause the engagement of the member supported thereon with the tool to prepare the first-mentioned member' for a predetermined assembled relation with the latter' member.

4. In apparatus for preparing a part for assemblage with other parts, a` longitudinally movable tool, means for guiding the tool, means normally urging the tool to a non-operative position, means for supporting a partin position to be worked on adjacent the tool, means for preliimnarily hold-V ing a. second part oi" the device in 'assembled relation with a plurality of parts which are to be assembled as a unit #ith the first oai't and for maintaining` the unit in operative relation with the tool, the mountingof the Vunit and latter part causing the' tool to be displaced an amount determined by an overall vdimension of the unit and the latter part, and means for causing a relative movement between the first part and the tool to prepare the first-*mentioned part for a predeter- A mined assembled relation with the unit and with the first part and for maintaining the lunit in engagement with one enLl of the .tool,'the mounting of the unit and thel latter part lcausing the tool to be displaced an amount predetermined by an overall dimension of the unit and the latter part, and means for rotating the support for the first part and simultaneously therewith moving the first part into engagement with the tool to cause a machining thereof to prepare the first-mentioned part for a predetermined assembled relationlwith theiinit and the latter part.

6. In apparatus for preparing a part for assemblage with other parts, a frame, a material working toolguided thereon, means normally urging the tool to Va non-operative position, means for supporting a part in position to be worked on adjacent the worin ing end of the Jtool, means within a recess provided in the frame for guiding a 'second part into predetermined vrelation with the 'opposite end of the tool, means for clamping opposite portions of a third part to theV trame at opposite sides of the recess with an intermediate portion thereof engaging the second. part and maintainingit against the oaposite end of the toolto control the effectiveness ofthe tool, and means for causing a relative movement between the first partand the woriring tool to prepare the first-mentioned part for a predetermined assembled relation with the latter parts.

7. In an apparatus :for preparing a member Vfor assemblage with another member,

a material working means, means for normally urging the working means longitudi# nally in one direction, means eccentrically mounted for supporting the member to be prepared for assemblage adj acenttlie working portion of the working means, means .Y

.ing the tool longitudinally awayjfromr said member, means for causing a relative move@ ment between the tool and said member through a distance determined by the overall dimensions of a member with which the first mentioned member is to be assembled, and means for causing the toolrto perform work upon the first mentioned member. 9. ln an apparatus for preparing a member tor assemblage with another member, a tool, means for eccentrically supporting a member to be prepared for assemblage adjacent the tool, .means for normally urging the tool away from said member, means for Veffecting a longitudinall displacement of the tool vtoward said member a distance determined by the overall dimensions of a member with which the first mentioned member is to be assembled, and means for causingV a relative movement between the rst mentionedV member and the tool to perform work upon the first mentioned member.

10. In an apparatus for preparing a meimJi ber for assemblage with another member, a material working means, means for normally urging the working means in Vone direction, means Vfor supporting a member to be prepared for assemblage adjacent a working portion of the working means, a resiliently actuated lever for holding another member forming a part of the assemblage in operative relation with another portion of' the working means to control the effectiveness of the Aworking means, vand means for causing a relative movement between the first member and the working means to prepare the first mentioned member for a predetermined assembled relation with the latter member. Y

ln witness whereof, I hereunto subscribe my name this 30th dayY of March, A. D. 1927. T Y

MARION LLEVVLLYN STRAWN.

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